include/asm-arm/fpstate.h

   1 /*
   2  *  linux/include/asm-arm/fpstate.h
   3  *
   4  *  Copyright (C) 1995 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #ifndef __ASM_ARM_FPSTATE_H
  12 #define __ASM_ARM_FPSTATE_H
  13
  14
  15 #ifndef __ASSEMBLY__
  16
  17 /*
  18  * VFP storage area has:
  19  *  - FPEXC, FPSCR, FPINST and FPINST2.
  20  *  - 16 double precision data registers
  21  *  - an implementation-dependant word of state for FLDMX/FSTMX
  22  *
  23  *  FPEXC will always be non-zero once the VFP has been used in this process.
  24  */
  25
  26 struct vfp_hard_struct {
  27         __u64 fpregs[16];
  28 #if __LINUX_ARM_ARCH__ < 6
  29         __u32 fpmx_state;
  30 #endif
  31         __u32 fpexc;
  32         __u32 fpscr;
  33         /*
  34          * VFP implementation specific state
  35          */
  36         __u32 fpinst;
  37         __u32 fpinst2;
  38 };
  39
  40 union vfp_state {
  41         struct vfp_hard_struct  hard;
  42 };
  43
  44 extern void vfp_flush_thread(union vfp_state *);
  45 extern void vfp_release_thread(union vfp_state *);
  46
  47 #define FP_HARD_SIZE 35
  48
  49 struct fp_hard_struct {
  50         unsigned int save[FP_HARD_SIZE];                /* as yet undefined */
  51 };
  52
  53 #define FP_SOFT_SIZE 35
  54
  55 struct fp_soft_struct {
  56         unsigned int save[FP_SOFT_SIZE];                /* undefined information */
  57 };
  58
  59 #define IWMMXT_SIZE     0x98
  60
  61 struct iwmmxt_struct {
  62         unsigned int save[IWMMXT_SIZE / sizeof(unsigned int)];
  63 };
  64
  65 union fp_state {
  66         struct fp_hard_struct   hard;
  67         struct fp_soft_struct   soft;
  68 #ifdef CONFIG_IWMMXT
  69         struct iwmmxt_struct    iwmmxt;
  70 #endif
  71 };
  72
  73 #define FP_SIZE (sizeof(union fp_state) / sizeof(int))
  74
  75 #endif
  76
  77 #endif